Apparatus for building roads



Sept. 15, 1936. MOSEL I 2,054,437

APPARATUS FOR BUILDING ROADS Filed Dec. 31, 1954 '7 Sheets-Sheet l INVENTOR. Joseph H Mose/ m PW A TTORNEYS.

Sept. 15, 1936. H, M EL 2,054,437

APPARATUS FOR BUILDING ROAfiS Filed Dec. 31, 1934 7 Sheets-Sheet 2' 20' 92 v 38 8 4a 9 67 65 2 3 6 5. A

I N V EN TOR. Joseph H Masai BY 4 I BIPW ATTORNEYS.

APPARATUS FOR BUILDING ROADS Sept. 15, 1936.

Filed Dec. 31, 1934 7 Sheets-Sheet 3 l8 I A 44 In D 6 uvmvrox.

Y Joseph hf Mosel My ATTORN Sept. 15, 1936. J. H. MOSEL APPARATUS FOR BUILDING ROADS Filed Dec. 31, 19:54

7 Sheets-Sheet 4 INVENTORL osel Joseph H /V ATTORNEY Sept. 15, 1936. J; MOSEL 2,054,437

APPARATUS FOR BUILDING ROAD S Filed Dec. 31, 1934 7 Sheets-Sheet 5 INVENTOR. Jose 0h H. M0521.

BY W ATTORNE Sept. 15; 1936. J, H MOSEL 2,054,437

APPARATUS FOR BUILDING ROADS Filed Dec. 51, 1934 7 Sheets-Sheet s IN V EN TOR. Joseph H Masai BY I my W ATTORNEY Sept. 15, 1936. J. H. MOSEL APPARATUS FOR BUILDING ROADS Filed Dec. 31, 1954 7 Sheets-Sheet 7 I N V EN TOR. Joseph H Mosal A TTORNEYS.

Patented Sept- 15, 1936 PATENT OFFICE 2,054,431 APPARATUS FOR BUILDING ROADS .losepli n. Mose], Columbus, Ohio, assignor m The Jaeger Machine Company, Columbus, Ohio, a

corporation of Ohio Application December 31, 1934, Serial No. 759,928, g 27 Claims. (01. 94-46 My invention relates to apparatus for building roads. It has to do, more specifically, with apparatus which lsadapted to receivebituminous mixes or other materials and to spread it across a surface to be covered, forming therefrom a layer or slab of the desired thickness and contour and having straight edges. However, there are features of my invention not necessarily limited to the spreading of asphalt or other bituminous materials.

In the past, there have been several machines devised for this purpose. However, these prior art devices are not entirely satisfactory in operation. This type of machine is sometimes used for spreading asphalt or other material over an old roadbed or over a roughly graded or other rough surface. The prior art machines which have been used for this purpose are of such structure that irregularities in the surface being covered are reproduced or not sufficiently eliminated in the new surface produced. Thus, it is practically impossible to produce, with the prior art machines, a surface which is even and which does not have a large number of raised and depressed portions, unless the surface which is being covered is already finished evenly. Another disadvantage of some of these prior art machines resides in the fact that it is necessary to employ side forms 'upon which the machine operates in order to limit the spreading of the material and produce a surface with straight edges. It is obvious that these side forms are expensive and that it requires a largeamount of labor and expense to install them.

One of the objects of my invention is to provide apparatus of the type indicated which will receive asphalt or other bituminous or other material and which will spread such material across the surface to be treated in a very efficientan old road bed or over a roughly graded or other rough surface, the apparatus being of such a nature that the longitudinal irregularities in the surface being covered willbe practically eliminated in the surface produced by the machine vceive the asphalt or other material. lower portion of this hopper, a spreading memand, consequently, the machine will produce a surface which is .very even and which will not be wavy".

Another object of my-invention is to provide a machine which is of such a nature that irregularities longitudinally of the surface being covered will have substantially no effect on the surface produced by the machine, which is provided with means for indicating the level of the screed at all times, based upon a given grade line, so that the screed maybereadily adjusted to compensate for transverse irregularities in the surface being covered.

In its preferred form, my invention contemplates the provision of road building apparatus comprising an outer unit which includes a pair of runnersthat are adapted to be drawn along the surfaceto be covered. These runners serve as side forms, for limiting spreading of the*mate rial on the surface to be covered, thereby producing straight edges on the layer or slab produced by the machine. These runners are of considerable length and the associated parts are so related, thereto, that even though they do operate over a rough surface,the effect of the longitudinal irregularities in the surface being covered upon the surface produced by the machine will be negligible.

Associated with the runners, a second unit is disposed andis so associated with the runner unit that it may float up and down without having any effect whatsoever on the runner unit. This second unit is carried by traction members which operate outside of the inner edges of the runners. It carries a hopper which extends entirely across the machine and is adapted to re- In the ber is mounted which will spread the material laterally in both directions across the surface to be covered and will compact it against the runhind the spreading member for levelling off the material spread by the spreading member to the desired thickness and contour. This screed member is carried by the runner unit; inasmuch as the runner unit is not afiectedto anymaterial extent by the irregularities in the surface being covered. Consequently, even though the surface on which the machine operates is rough. the

surface produced by the machine will be very even.

I preferably provide adjustable means at each end of the screed member which permit some of I as . in side elevation the material to pass rearwardly of the screed v inFigure 11.

member. On the rear end of each of the runners, I provide an auxiliary screed member which levels 011 .the material that bleeds past the corresponding end of the main screed member. These auxiliary screed members are so disposed that they feed the material laterally so that it will cover that portion of the rough surface over A which the runners have operated or, in other words, will. produce a layer of material which is wider than the distance between the runners. themselves. I also provide means for indicating the level of the screed, based upon the given grade line, so that it may be readily adjusted to prevent transverse irregularities in the surface being covered from being reflected in the surface produced by the machine. As stated, the longitudinal irregularities in the surface being covered will have substantially no. effect on the surface produced by the machine since the screed member is carried by the long runner-members.

The preferred embodiment of my invention is illustrated in the accompanying drawings wherein similar characters of reference designate cor responding parts and wherein:

Figure 1 is a perspective view of a road building machine constructed in accordance with the principles of my invention.

Figure 2 is a side elevation of the'machine;

Figure 3 is a plan view oi' the machine.

Figure 4 is a rear elevationof the machine.

Figure .5 is a front elevation of the'machine.

Figure 6 is a plan view,'more or less diagrammatic, illustrating how the adjustable auxiliary screed members on the rear ends of the runners may be adjusted so that the portion of the rough surface over which the runners slide may be covered. I

Figure 7 is a side elevation illustrating how the runner unitmay be raised and supported on the inner unitfor transportation.

- Figure 8 is a detail partly in section and partly taken substantially along line 8-8 of Figure 9.

Figure 9 is a detail showing the adjustable means at the, end of the screed member which may i be adjusted to permit bleeding of material rearwardly past the end of the screed member.

Figure 10 is a section illustrating a spring and a housing therefor, such spring being one used in tying the runner unit to the inner spreading, unit so that it will be partly supported by the inner unit.

Figure 11 is a perspective view of a machine madein accordance with the principles of my invention but modified in'several respects as compared to the machine illustrated in the preceding figures. Y

Figure 12 is a detail in perspective showing one end of the screed of the machine of Figure 11, the means for vertically adjusting the end thereof, and the material bleeding means of this machine.

Figure 13 is a detail in perspective, partly transverse vibration of the screed member. Figure 14 is 'a perspective view showing different means for causing transverse reciprocation of the screed. s

Figure 15 is a perspective view showing the indicating means which I preferably use on the screed for indicating whether or not the screed is properly adjusted during operation of the machine. w

access? Figure 161s a plan view of machine shown l-igul'e 17 is a transverse section of the machine, more or less diagrammatic, showing the level indicating means applied to the screed unitand illustratingthe screed and'level indicating means before they are properlyadjusted.

Figure' 18 isa view similar to Figure 1'1 but illustrating the screed member and the level indicatingmeans properly. adjusted.

The outer or runner imit 'With reference to the drawings, and particularly to Figures 1 to '7 inclusive, I have shown fmy apparatus as comprising a pair of runner mem-- hers I, one of which is disposed at each side of the machine. These runner members are adapted toslide along the surface to be terial spread by the machine.

The runner members are preferably constructed as indicated in thedrawings and are made of metal. They are preferably of hollow construccovered by ma-' tion and embody an inner plate 2 and an outer 'plate 3 which are spaced apart and which are joined together at their upper and lower edges as indicated. The forward end of each of the runners has its bottom upwardly curved 'as indicated at 4 (Figure 2) so that there will be no danger of it digging into the surface upon which it'slides. The rear end of each runner is curved upwardly as indicated at 5 and then rearwardly to form a rearwardly projecting horizontal portion 6 which is at a much higher level than the body portion of the runner.

The tworunners are rigidly secured togetheradjacent their rear ends by a beam unit I, the ends of which are boltedjor otherwise secured to supports 8 which are disposed between the inner and outer'plates of the runners and project upwardly from the upper edge thereof. This beam unit 1 is provided with a telescoping section 9 interposed substantially midway between the ends thereof. By this telescoping section it ispossible to make the beam unit longer or shorter and thereby increase or decrease the distance between the two runners. Forward of the beam unit 1 another beam i0 is provided for securing the runners together and for another purpose to be dee scribed subsequently. This beam ishorizbntally disposed and each end thereof is removably bolted to an inwardly projecting member I I on each runner. A plurality of sets of openings for the bolts are provided so that the distance between-the two runners may be varied. The forwardends of the two runners are held together by a transversely extending beam i2 (Figure 5). The ends of this beam are secured to the inner surfaces of the runners and this'beam is provided with a telescoping section i3 which permits the distance between the two runners to be varied.

At the rear end of each of the runners I provide an auxiliary screed structure which cooperates with the main screed structure ina manner to be described subsequently. Each of these auxiliary screed structures comprises a vertically disposed plate ll which has its inner end connected to the transversely extending beam 1 by a slot and pin connection I 5 so that it will be vertically adjustable. This plate I extends rearwardly and outwardly at an angle. A second vertically 'disposed plate l6 overlaps the plate I! and extends outwardly past the outer end thereof. A longitudinally extending reinforced delimiting plate structure [1 is secured to theouter end of plate It by. means. ofbolt.

U tion 6 at the extreme rear end of the runner.

and slot connections I641 so that plate III may be vertically adjusted relative to plate IS. The plate I8. is provided with a horizontally disposed flange l8 on its lower edge which projects rearwardly beneath the lower edge of plate I4.

I provide means for vertically adjusting the entire auxiliary screed unit and this means comprises a shaft 18 which is threaded downwardly through a suitable bearing disposed in the por- A hand wheel 28 is provided for operating this shaft I 8 and the lower end of the shaft is secured in a member 2| which is attached to the front surface of the plate l4. By adjusting shaft IS the .entire unit including plates l4, I8, and I! may be vertically adjusted. An indicator pointer 22 is mounted on plate l4 and projects into cooperative relation with graduations 23 on the runner for indicating the height of the auxiliary screed unit.

I also provide means for adjusting the plates l4 and I8 longitudinally of each other to vary the effective length of the auxiliary screed unit. As shown, this means embodies a pair of rods 24 3 having their outer ends welded or otherwise secured to plate I8 as at 25. These rods extend through guide members 28 and are free to-slide I therein. The guides 26 are disposed on the rear that also passes through the lever 21, may pass.

surface of plate l4. A lever 21 has its lower end pivotally connected to the plate I4 as at 28. This lever is connected intermediate its ends to the upper rod 24 by a pin and slot connection 29. An arcuate bar 30 is disposed on the upper edge of plate I4 and is provided with a plurality of openings through any one of which a bolt 3|,

It will be apparent that by removing bolt 3| and swinging the lever in either direction, the plates l4 and It will be moved longitudinally of each other and the effective length of the auxiliary screed member will be varied. This adjustment will also cause'movement of plate II which may I be moved into alignment with the runner or may be moved to a position where it is spaced out- -wardly therefrom. The function of this auxiliary screed member will be described more in detail ereinafter. 4

The inner. or spreading unit Within the runners l, a second unit is disposed and this unit may float up and down without having any effect whatsoever on the unit of which the runner members I form a part. This unit embodies a main frame 32 which comprises a pair of longitudinally extending side beams 33 which are'joined together adjacent their rear ends by transversely extending beams 34 and 35.

The forward ends of these longitudinally extending beams 33 are joined together by-a hopperstructure 38. This hopper structure embodies a This hopper member has its ends closed-by ver- 'tically extending plates 48. The "hopper is adapted to receive the material which is to be,

spread on the. surface to bencovered. Longitu dinally extending beams 41 have their rear ends.

bolted tothe transverse beam 38 and their forward ends bolted to the plate 31 which serves as the rear-wall forthe hopper. beams 4F are parallel to beams 33 and each of them is spaced an equal distance from the beam 33 on Another longitudinally the corresponding side. extending beam 42 is disposed between beams 4| and has its rear end bolted to transverse beam 35 and its forward end to the plate 31.

In the bottom of the hopper I provide a spreadingmember 43 for spreading the material which is dumped in the hopper laterally towards the runners. pair of wide blades 44 which have their inner ends adjacent each other and connected to the outer end of a forwardly extending support 45. The rear end of this support 45is secured to the rear wall 3'I-of the hopper. The blades 44 are so arranged that they extend outwardly and rearwardly at an angle and their outer ends are attached to the rear wall 31 of the hopper as at 48. As shown in Figure 2, the bottom of the hopper terminates at a point 41 which is spaced above the lower edge of the runner. Also the bottom edges of the wide blades 44 are substantially in line with the lower edge of the hopper.

This spreading member 43 embodies a.

It will be apparent that the blades 44 will feed the material dumped in the hopper laterally across the surface to be covered and against the inner sur' surface to be covered. These traction means preferably comprise a pair of large forward wheels '48 and a pair of small rear wheels 49. The wheels operate along the same paths as the runners.

All of these, wheels are disposed between the inner and outer plates of the runners extending through slots formed therein and resting on the surface along which the machine moves. Each of the wheels 48 is mounted at the forward end of an arm structure 58 embodying spaced parallel bars and each of the wheels 49 is mounted at the rear end of 'such arm structure. Each of the axles 5| upon which the wheel 48 is mounted extends inwardly (Figure 5) and is slidably supported in bearing members '52 secured to the outer surface of the hopper structure of the inner unit. The axle is free to slide in the bearing members so that even though'the wheels are disposed within the runners, the distance between the runners may be increased or decreased. A stop 54 is provided at the extreme inner end of each of the axles to prevent complete withdrawal of the axle from the bearing members 52. Vertically disposed guide members 55 project upwardly from the beam structure i 2 of the runner unit and are provided with guideways or slots in their upper ends within which the axles may move up and down. Thus, the wheels and axles may rise and. fall without afiecting the runner unit. A guide member 58 has'its lower end disposed between the inner and outer plates of the runner unit (Figure 1) andprojects upwardly between the spaced parallel bars of the .arm 58.-'-.This memberji serves to guide vertical movement of arm and prevents the wheels 48 and]! from contacting with either the outer or inner plates of the runners.

' The inner or spreading'unit is supported on the traction wheel structure in the following manner. Each arm structure 88 is provided with a vertically extending yoke 51 which has the'outer end of a pivot pin 58 mounted inthe upper ends of the arms thereof. This pivot pin 53 extends inwardly into a pipe '58 within which it rotates and which is supported by a beam 33 and beam 41 The pivot pin 58 is slidably mounted in the pipe 59 so as to permit varying of the distance between the runner units and consequently the distance between the wheels on opposite sides of the machine. Thus, the inner unit is supported on the arms 50 which are supported on the traction wheels by pivotal connections directly opposite each other. The inner unit is free to rock about these pivot points. The beam 34 of the inner unit is provided with slotted depending members 80 through which the beam unit 9 passes. Thus, the rear end of the inner .unit may move up and down without having any effect on the runner unit. The depending members 60 which cooperate with beam unit I at the rear of the machine and the upstanding members 55 at the forward end of the machine serve to tie the inner unit, which is carried by the traction wheels, to the outer runner unit in such a manner that when the inner 'unit is moved along the surface to be covered,

the outer or runner unit will be dragged along therewith. Also, the inner unit is tied to the outer unit in such a manner that when the traction wheels strike irregularities in the surface upon which they operate, the .inner unit will be caused to float up and down without having any effect whatsoever on the horizontal position of the runner unit. The forward end of the inner unit is provided with hooks 6| so that means may be atached thereto for pulling the machine along the surface to be covered.

It will be apparent that as the machine moves along, the runners will slide along over the surface which is being treated. In order to reduce the sliding friction of the runners and also to provide means for supporting the runner unit on the inner unit entirely with the runners spaced from the ground for purpose of transporting the machine to a different location, I provide the following structure (see Figure 7).

At each side of the machine a drum member 62 is mounted for rotation. The drum member may be rotated by means of a crank 63 and ratchet mechanism 64 is provided for preventing rotation of the drum in one direction. A rearwardly extending cable 65 has its forward end attached to the drum and winds around the drum in one direction. A forwardly extending cable 66 has its rear end secured to the drum and winds 'therearound in an opposite direction. The cable fii'passes rearwardly and then downwardly over a pulley 61 mounted on the rear end of beam 33 .and its lower end is connected to the rear end of the runner on the corresponding side. The other cable 68 passes forwardly and then downwardly'over a pulley 68 rotatably mounted on beam 33 at a point in front of the pivot pin 58 and its lower end is connected to the runner.

In Figure 10 I show a spring structure which I preferably employ for connecting the lower end of each of the cables to the runner unit. This structure embodies a spring housing 69 having an upstanding lug 10 on the upper end thereof. to which the cable is attached. A compression spring II is disposed in the housing in surrounding relation to a rod 12 which passes through an opening in the bottom of the housing. Thisrod has a head or disk 13 on its upper end. The lower end of the rod is adapted to be connected to the runner. It will be apparent that this provides a resilient connection'between the ends of the cables andthe runners.

During normal operation of the machine the crank 63 is rotated to cause rotation of the drum 62 to such an extent that the runner'will 'Just rest on the surface. Although the'runner will contact with the ground, it will be partially and resiliently supported by the inner unit and the amount of friction developed will be materially reduced by the cables and spring structures. When the drum 62 is rotated in one direction it windsboth cables 65 and 86 thereon thereby causing raising of the runner unit. If the ratchet is released to permit rotation of the drum in an opposite direction,-both of the cables will unwind from the drum and the runner' 'unit will be lowered. For the purpose of transporting the machine to a different location, the drums may be rotated to cause the runner unit to be raised so that it will be completely supported on the inner unit and consequently upon the traction wheels so that the runners will be spaced from the ground, as shown in Figure 7.

The screed unit As previously stated. it is very important to being covered will be practically eliminated in the surface produced by this machine. I provide a screed member which levels of! the surface of the material spread by the spreading unit and which makes the layer the desired thickness and contour. This screed is so mounted that itwill not be materially affected by longitudinal irregularities in the surface being covered and over which the machine passes. As previously stated, the runner members I may pass over a rough surface to be covered but since they are of such great length, the longitudinal irregularities in the surface do not materially affect the outer runner unit to any material extent. Therefore, it is desirable to have the screed unit, which determines the contour and thickness of the layer of material or, in other words, produces a finished-surface, mounted on the outer runner unit. Also, it is desirable to have the screed member located substantially' midway between the ends of the runners, so that any irregularities over which the runners do pass, will havethe least effect on the position of the screed.

The screed member 14 is illustrated best in Figures 1, 8, and 9 and consists mainly of a plate member which has a vertically disposed forward portion 15 which has a rearwardly extending flange I8 on its upper edge and a rearwardly extending shoe or surfacing member 11 on its lower edge. The forward portion 15 of the screed will contact the material which is spread by the spreading member and the shoe 11 will level it 011' and finish it. Suitable means (not shown) is provided for producing the desired crown in the shoe or finishing surface I1 so as to impart the desired crown to the surface to be produced. The screed member 14 is disposed directly behind the rear wall of the hopper membenthe forward member I! of the screed overlapping the rear wall 31 of the hopper. ,However, thesurfacing member 11 of the screed will always-be disposed below the lower edge of the wall 31, as indicated at 18 in Figure 2.

The screed I4 is provided with an adjustable telescoping section 19 at each end thereof whereby .is provided with a vertically extending wall 83.

The screed member 14 is suspended from the runner unit in such a manner that each end may be adjusted independently of the other to'the proper level. This will determine the thickness of the layer of material produced. This suspending means comprises an inwardly projecting support 84 which has its outer end bolted to the runner unit I as at 85 and has a threaded bearing 86 on its inner end. A threaded vertical shaft 81 is threaded through this bearing 86. This shaft may be rotated by a hand wheel 88. The

screed I4 has an outwardly projecting extension 89 which has its inner end telescoping in a guideway 80 on the screed. The lower end of the shaft 81 is connected to the outer end of extension 89 by means of a ball and socket connection 9| which will permit one end of the screed to be raised higher than the other end without binding and also willpermit tilting of the screed about its own axis. Since the extension 89 telescopes with the guide 90' at the end of the screed and since the section 18 telescopes with the end of the screed, this will not interfere with adjustment of the two runners towards and away from each other.

at the end of the screed from its position indicated in Figure 9, where its outer end is disposed substantially in contact with the inner surface of runner I to a position where the end thereof is spaced from the inner surface of the runner. In this latter position, material will be permitted to bleed back past the ends of the screed member. This means comprises a lever 92 which is pivoted as at 88 to a support 94 that is attached to longitudinally extending beams 33 and -"'II of the inner unit. The lower end of this lever is pivoted as at 85 to a link 88 which has its opposite end pivoted to the upper and outer corner of the section 18 as at 91. It will be apparent that by swinging lever 92, the section I9 will be caused to slide into and out of the end of screed member I4 so that the end of the section will be directly adjacent the inner surface of the runner, as indicated in Figure 9 to prevent passage of material past the screed member, or the end of the section will be spaced from the inner surface of the nmner to permit passage, of the material rearwardly past the ends of the screed member. The lever 82 is pivoted to the inner unit as at 93 but because the lower end of lever 82 is connected to the section I9 through the medium of link 96. floating of the inner unit will be. permitted without having any effect on the end of the screed member.

The screed member I4 is further connected to the runner unit by a pair of rods 88 disposed adjacent each end of the screed'member. One

- of the rods 88 of each pair is disposed at a higher level than the other rod thereof (Figures 1 and 8). The forward end of each rod is pivotally connected as at 08, to a bearing member I which is pivoted for swinging in a horizontal plane, in such a manner asto permit vertical swinging thereof. This bearing member I80 ispivotally connected as indicated to the screed member by a pivot structure IOI which is attached to the rear side of a vertically extendingstrap member I 02 which is suitably attached to the screed member itself. The rear end of each of the rods 80 has a universal pivotal connection as at I03 (Figure 1) tothe transversely extending beam I0that aids in con-.

necting the .two runners together in such a manner as topermit swinging thereof in both horizontal and vertical planes. Each of the rods 98 has a turnbuckle I04 disposed therein by which the effective length thereof may be varied. It will be apparent that by shortening the upper rods 98 and lengthening the lower rods 98, the screed member may be tilted about its own axis so that the shoe or finishing member 11 of the screed will be tilted with its forward edge higher than its rear edge. With the screed tilted in this manner it will serve to bring about a better compaction of the material which it levels ofl and finishes.

I provide means for causing a very rapid vibration of the screed member I4. The rear surface of the screed member (Figures 1, 3', 8, and 9) is provided with a plurality of bearings I05 spaced longitudinally thereof. These bearings support for rotation a shaft I06 that extends longitudinally of the screed member. This shaft has a pair of weights I01 keyed thereon. These weights are substantially cylindrical in form and are eccentrically keyed on shaft I06. A weight I01 is disposed adjacent each end of the shaft and each weight is disposed between two of the bear--, ings I05 which are spaced fairly close together. The weights are so disposed that they rotate in a vertical plane. Consequently, since they are eccentrically mounted on the shaft I06, when the shaft is rotated the screed member will be caused to rapidly vibrate. 'This serves to bring about better finishing and compacting of the material finished by the screed member. The shaft I06 is rotated by a suitable motor I08 through the medium of pulleys I09 and a belt H0.

The motor I08 is supported behind the screed member a suitable distance on a platform III. This platform iII has its ends secured to a pair of bars II2 (Figures 3 and 8) extending longitudinally of the machine and having their lower ends pivotally connected to the screed member as These bars have their outer ends joined together by a transversely extending rod I I I.

This rod II I'is pivotally connected to a transversely extending rod II5 disposed thereabove through the medium of a link H6 which is pivtion wheels operate, it will not disturb the driving connection between the motor I08 and the shaft I08. Some of the vibration will be transmitted to the rear end of the frame of the inner unit and since this frame is pivoted on the pivot pins 88, the forward end of the frame of the inner unit will also be vibrated. This will vibrate the hopper and tend to prevent the material from sticking" therein.

The operation of the machine may be-adjusted to a position which is higher.

than the other end by the mechanism previously described. Also,,the screed member may be tilted around its own axis if desired. The drum memhere 02 are rotated sumciently to permit the run- 76 ners to just rest on the ground and to be partly and resiliently supported on the inner unit. Material is dumped into the hopper 36 and the machine is then drawn along by any suitable means.

The material drops to the bottom of the hopper and the spreading member spreads it laterally in both directions across the surface to be covered and compacts it against the inner surfaces of such surface will not be reflected in the surface This is due to finished by the screed member. the fact that the inner unit only is supported by these traction wheels and this inner unit I mayfioat'up .and down relative to the outer ,r'unner unit without having any effect whatsoever on, the runner unit. The' screed member is carried by the runner members which are of comparatively great length and which will pass over the rough surface and will not follow the depressions and bumps of said surface. Thus, the surface produced by my machine will be very level wand even anddevoid of depressions and bumps.

'- The runner members I extend behind the spreading member and the screed member a considerable distance and, consequently, these members will cooperate with the edges of the layer of material already spread in maintaining the machine on its course.

The machine may be operated to spread material over the surface at each side of the machine upon which the runners operate after the runners move along. Thus, it is possible to produce a layer of material which is wider than the;

distance between therunners. To accomplish this, the sections 19 at each end of the screed member may be adjusted to permit bleeding of some of the material past the ends of the screed member as previously described. As the machine moves along, this material which will be close to each runner will be leveled off 'andocompacted by the auxiliary screed members disposed at the extreme rear ends of the runners. To cover the surface over which the runners passed, it will be necessary to adjust the auxiliary screed members-to positions similar to that indicated in Figure 1 wherein the delimiting plates I! will be spaced laterally outwardly from the runners.

The auxiliary screed members will guide the material, which. passed rearwardly of the screed member, outwardly behind the runners and the plates I] will function as sldeforms Iimiting spreading of,.the.. material and producing a straight edgethereon. The auxiliary screed members may be adjusted to the same level as the rpf material will be of the same thickness as 't hefinner portions thereof or varied as desired.

'rhe'bleeding mechanism and the auxiliary screed 'memberf'at one smear the machine may be operated independently of the corresponding members on the op posite 'side of the machine. In some cases it may be desirable to cover the sur-' face over which one ofv the runners slides and 'not cover the surface over which the other runner slides.

' The bleeding mechanism and the coopeiratin'g *member 14 so that the edge portions of auxiliary screed members may be employed in obtaining a layer of material wider than the maximum distance between the two runners. However, as previously described, the machine is constructed throughout so that the distance between the runners may be varied in order to produce layers of material of different widths.

Modifications In Figure 11 I show a modification of my machine. The basic principles'of this modification of themachine, 'however, are identical with those of the machine previously described. In this instance the machine comprises an outer runner unit andan inner or spreading unitthat is free to float up and down without having any' effect on the runner unit. The runner unit consists of a pair of runners vIn, as before, which are held together inspaced relation by telescoping beam members so that they may be adjusted farther apart or closer together. The inner or spreading unit 32a .is mounted within the runner unit and is tied thereto, as before, in such a manner that it may float up and down relative to the runner unit. 'A pair of forward traction wheels "a and a pair of rear traction wheels 49a are disposed in the runners. mounted on the outer ends of axles which are slidably mounted on the inner unit 321: in a manner similar to the axles ii of wheels 48 of the imachine first described. Thus, the inner unit 3211 is carried'by thetraction wheels and when the traction wheels operate over irregularities in the surface being covered, vertical movement of the inner unit will result but this will have no eifect whatsoever on the runner unit. The traction wheels are adapted to be driven by means to be described in order to propel the ma-- chine along the surface to be covered. 1 Ya In order to partly support the runner unit by the inner unit to prevent the generation of too much friction between the runners and the surface over which they slide, I provide slightly different resilient connections, in this instance, between the inner unit and the runner unit.

In this instance a spring housing 69a is disposed adjacent each traction wheel and is rigidly carried by the outer end of the axle and, consequently, is carried by the inner unit. A rod 12a extends through this-housing and its lower end is connected to a beam I20 which is rigidly secured to These wheels are the runner. The housing 69:: has a compression spring Ila disposed therein and the upper end of the rod has a disk Ila adjustably mounted thereon which bears against the upper end of spring Ha.- Thus, the effect of the spring may be easilyvaried. The springs are adjusted to permit the runnersto slide on the surface uponwhich they operate but to reduce the amount of friction produced.

As before, I provide However, the auxiliary screed members Ila are somewhat different from those previously described. Each auxiliary screed member Ila plate I 22 projecting rearwardly from the lower edge'thereof. A plurality ofturnbuckles I23 have their upper ends connected to the upper edge of thevertical plate III and their lower ends connected to the rear or outer edge of the plate I12. By means of these turnbuckles, the finishing plate member l22 maybe' tilted transversely of itself so that its forward edge will be higher than its rear edge and it will therefore exert a comauxiliary screed members 7 which are mounted at the rear ends of the run- .ners.

comprises a vertically-disposed plate HI and a pacting action on the material which it strikes. Also, it may be bowed longitudinally of itself by the turnbuckles to produce the desired crown.

The auxiliary screed member I4a has a longitudinally extending delimiting plate unit I'Ia at its outer end which limits outward movement shaped member I29 slides.

of material spread by the screed and which serves as a side form to shape the edge of such material.

This unit I'Ia has an outer plate member I24 and an inner plate member I25 adjustable vertically relative to each other by means of bolt and through a bearing in the rear end 6a of the runner. The lower end of this shaft carries a substantially U-shaped guide I28 in which a U- This member 129 is welded or otherwise secured to the rear end of the auxiliary screed member I411. The member I29 is provided-with longitudinal slots I 30 through which the lower end of shaft I21 passes and which permit sliding of the member I29 back and forth in the guide member I28.

The forward end of the auxiliary screed is mounted on the runner unit in a similar manner. A vertical shaft I3I is threaded through a suitable bearing carried by the transversely extending beam 'laadjacent the rear of the machine which connects the two runners n'gidly together.

A U-shaped guide I32 is carried by this shaft and a U-shaped member I33, which projects laterally from the rear end of the auxiliary screed v 7 mit sliding movement of member I33 in the guide I32. Thus, either end of the auxiliary screed I4a may be adjusted verticallyindependently of the'other end by adjusting shaft I21-or.,shaft I3 I. Also, it will be apparent that the auxiliary screed may be adjusted in or out relative to the runners so that the plate unit I'Ia will be in alignmentwith the runners or will be spaced laterally therefrom.

The means for adjusting theauxiliary screed member in or out relative to the runner comprises a longitudinally extending shaft I35 which is mounted in suitable hearings on the runner; This shaft has a segmental gear I36 keyed thereon which is engaged by a worm I31 on the outer end-of a shortshaft which is rotatably mounted in a bearing on the runner and is rotatable bya hand wheel I38. At the rear end of this shaft a depending link I39 is mounted thereon by means of a collar at its upper end which is keyed thereto. The lower end of this link I39. is pivoted to the outer end of a link I40 which has its inner end pivoted at I4I to the inner end of the member I36 which is rigidly secured to the rear end of the auxiliary screed member." The forward-end of shaft I35 passes through a collar on the upper end of alink I42 and is keyed thereto. The

the hand wheel I33 either of the auxiliary screed members may be adjusted in or out relative to the runner. 1

In order to prevent the guide I28 from turning on the lower end of shaft I21 and for indicating the height of the rear end of the auxiliary screed, I provide a bar I45 which has its rear end welded or otherwise secured to the upper surface of member I28 and its forward end adjustably secured to the runner by a pin and slot connection I45. This bar I45 passes through a slot in a member I4'I which extends outwardly from the upper edge of the auxiliary screed member. The

bar .I45 cooperates with a member I48 having calibrations thereon to indicate the level of the}.

auxiliary screed.

The inner unit 320. carries a hopper 36a similar to that in the machine previously described. However, the spreading member 43a which is mounted in the bottom of the hopper is, in this instance, a screw spreading and beating member. This screw spreading and beating member 430. embodies twov sections I 49 (Figure 16) which feed the material in opposite directions and compact it against the inner surfaces of the runners. Each section 349 is made up of a plurality of smaller sections I59 which may be readily attached to or detached from each other when it is desirable to vary the length of the section I 49 in order to produce layers of material of different widths. Thus, it is possible to remove a small section I50 of the section I49 or add other small sections I50 thereto. Each section I49 comprises a plurality of removable small blades I5I which are arranged helically on a shaft I52. When the shaft I52 is rotated by means to be described'the section I 49 will feed the material outwardly towards the runner. Because a plurality of small blades I5I are provided, asphalt or other bitumen material will not readily stick thereto. The fine-ll blades will beat the material and will break A screed member 14a. is carried by the outer runner unit. Since this screed member is carried by the runner unit which is not aflected by up and down movement of the inner unit 32a and since it is the member which finally finishes the layer of material produced, longitudinal irregularities in the surface being covered will be practically eliminated in the layer of material prowh ch is fastened to a'rearwardly extending shoe or surfacing plate I54. This member I54 is fairly wide and has angle irons I55 secured to its upper surface adjacent its front and rear portions. The upper edge of the plate I53 has a rearwardly extending flange I 56 of comparatively narrow width. The forward edge of the shoe or plate I54 is provided witha plurality ofteeth I51. so

that it will more eifectively cut or break up sticky material.

The unit comprising plates I 53 and I54 is se- Spaced brackets I59a are bolted to the upper surface of beam I59 and connected by bolt and slot connections to the rear surface of plate I53. Brackets. I592; are bolted to the lower edge of beam 'I 59 and are attached to an upstanding flange I540 adjacent the forward edge of'plate I54. Bars I60 extend transversely of beam I 59 and are secured on the upper edge thereof. These bars have open-ended slots into whichthe, upper ends of cured to a transversely extending beam I53.

hanger rods 166a may-be slipped. A plurality of pairs of these hanger rods I660 are provided at longitudinally spaced intervals. Each of the rods is pivotally connected to angle iron I and the upper end is provided with nuts adjustably threaded thereon. It will be apparent that by proper adjustment of the nuts onithe various rods, a crown may be produced in plate I54. Also, the plate may be tilted.

Each end of the screen'14a is spaced from the runner unit'Ia. The screed is provided with a supporting extension. I6I (Figure 12) which has its inner end rigidly secured to beam I59. This member I6I has its outer end pivotally connected to' a pair of depending links I62. The upper ends of the links I62 are pivotally connected to a block I63. A vertically disposed shaft I64 has its lower end secured t6 this block and passes freely upwardly through a bearing I65 carried by upstanding supports I 66 which project upwardly from the runner. The upper portion of the shaft is threaded as at I61 and a bevelled gear I66-is threaded thereon. It will be apparent that by a rotating gear I66 in the proper direction, the shaft I64 may be vertically adjusted and consequently the end of the screed may be raised or lowered. In order to rotate bevelled gear I68 a longitudinallyextending shaft I69 is provided. This shaft I69 is mounted in suitable bearings carried by the runner and extends to the rear of the machine where it may be rotated by means of a hand wheel I16. The forward end of the shaft I69 carries a bevelled gear I" which 'meshes with .the gear I66. 1

The screed member 'is positioned directly behind the hopper member and overlaps the rear wall thereof. As before, it will always extend below the lower edge of the hopper so that'it will level off the material spread by the spreading member. Either end of the screed member may be adjusted vertically without affecting the otherv end.-

I provide means for causing a very rapid vibration of the screed. This means comprises a cylindrical weight I12 (Figure 13) which iseccentri cally keyed on a vertically disposed shaft I19 r0 tatably carried by a housing I 14 which is bolted to the rear surface of the upstanding plate I53 of the means to be described. It will'be apparent that when the eccentric weight is rotated it will cause a rapid vibration of the screed. This greatly enhances the finishing of the materialby the screed. This movement will be permitted because the blocks I63 on the lower ends of shafts I64 are pivotally connected to the screed.

As previously stated, the ends of the screed are spaced from the runners. These spaces are provided to permit material to bleed back past the end of the screed and to be acted uponby theauxiliary screed members in a manner previously described in the discussion of the first machine. I provide means for governing this bleeding action. As shown in Figures 11 and 12, at ach end of the screed a gate 19 is provided which overlaps the end of the screed considerably so as to. permit varying of the. distance between the two runners. This gate has its outer edge secured'to a-bar I11 which is mounted for vertical slidingmovement in a vertically disposed guide I16 mounted on the runner and the upstanding support I69. e In order to raise and lower the gate 19:: I pro-.

.nected as at I6I toavertically disposed link I62 which has its lower end pivoted to the upper end of bar I 11. .The oppositexarid lower end of the triangular frame is pivotally connected at I63 to a longitudinally extending shaft I64. This shaft I64 extends rearwardly to the rear end of the machine and is rotatably disposed in suitable bearings carried by the runner. It may be rotated by means of a hand wheel I65 to raise or lowerthe gate'19ain a manner which will be obvious. Thus, the amount of material which bleeds back past the ends of the screed member may be controlled. Each gate may be operated independently of the other.

All of the various hand wheels which are used for controlling the various adjusting members of the various parts of the machine are grouped at each side-of the machine adjacent the rear thereof which will be apparent from Figure 11. This facilitates operation of the machine.

The driving means for this machine is best shown in Figure 16. An'englne I66 is shown which drives a transversely extending shaft I61 atively connected to the traction wheels by sprocket and chain drives, I89, as shown. Clutches I are interposed in'shaft I61 and may be operated so that the traction and propelling means at one side of the machine may be rendered operative while such means at the other side of the machine operates in order to faci11-.

tate guiding of the machine. The traction and propelling means at both sides of the machine may be rendered inoperative when desired.

The engine I 66 drives the spreading member through the medium of a drive shaft I9I. The

' spreading member may be rotated or" prevented fronirotating by operation posed in shaft I9I.

of a clutch I92 inter- The shaft which carries'spir al gear I16 and which rotates the eccentric weight I12 that vibrates the screed is driven in the following manher. A shaft I99 is driven by the engine through a suitable drive connection, as shown. This shaft drives a pulley I94 by means of a belt drive I95: The pulley I94 drives the pulley I96 on the outer end of the shaft extending from housing I14 by means of a belt drive I91. A clutch I915! is provided for rendering the driving means for the eccentric weight operative or inoperative. Thus, the screed may be vibrated when desired or the vibration means may be rendered inoperative.

In Figure 14- I show a slightly diiferenttype of screed and different means for reciprocating the screed transversely. In this instance the screed plurality of turnbuckles that may be used-for tilting the finishing surface of the screed. This screed will be suspended .in a suitable manner similar to that previously described so that it. may

be reciprocated transversely. Rollers I99 and 299 contact with the front and rear surfaces ofa plate III 11811 3 secured to the back of the screed.

unit. The roller 2" operates in a groove 262 and is mounted on a shaft which is vertically slidable in its bearing. These rollers prevent friction being generated during transverse vibration of the the screed and while the screed advances through walking beam 206 is pivoted to a rod 209 which has its opposite end connected to a ring 2l0a 1 which embraces a circular eccentric block 2"] that is keyed on the outer end of a shaft 2. The shaft 2| I is driven by a motor 2 I2 and clutch 2l3 is provided for rendering the shaft operative or inoperative. Rotation of the eccentric block 2! will cause oscillation of the walking beam 206. This, in turn, will cause transverse reciprocation of the screed.

The screed level indicating means As previously stated, longitudinal irregularities will have substantially no effect on the surface produced by my machine. However, transverse irregularities in the surface being covered may sometimes necessitate adjustment of the screed member in order to prevent them from having anyeffect on the surface produced. Therefore, it is desirable to have some indicating means for indicating at all times the level of the screed, as compared to a given grade line, so that the operator may readily adjust the screed to compensate for such irregularities so that the surface produced by the machine will not only be substantially free from irregularities longitudinally thereof but will also be substantially free. from irregularities transversely thereof thereby producing a true contour or crown when building roads in lanes or sections.

In Figure 15 I show indicating mechanism which I-may use. embodies av line or wire 2l3 which is stretched transversely of the machine. This line is preferably connected to the blocks I63 which are supported on'the lower ends of shafts I64 disposed at the ends 'of the screed unit (Figures 11 and 12) and which are used for vertically adjusting the screed member. to the screed member each end thereof is the same distance from the lowermost edge of the corresponding end of the screed member. Furthermore, since the ends of the line are connected to members which move with the screed member upon vertical adjustment thereof, the relative positions of the screed and line will always be the same. The line is provided with a spring 2 ll interposed therein to keep it taut.

Disposed substantially midway between the ends of line H3 is a bar 2l5. This bar has a level ZIG mounted thereon. This level is that type which embodies a tube which is substantially filled with liquid but has a bubble therein. Each end of the level M6 is pivotally connected at 2|! to the lower end of a bolt 8 which passes upwardly through the bar M5 and has a wing nut 2l9 threaded thereon. The level is also provided with a pair of upstandlng arms 220 which project up through slots MI in the bar 2I5. Thesear'm's' preferably have suitable cahbrations thereon for indicating whether or not the level is parallel to the line 2|3. It willbe apparent that the level may be readily adjusted so that it will betilted'relative to the line.

In Figures 17 and 18', I illustrate how this level indicating means functions. Figure 1'7 illustrates the machine being used to lay one lane This indicating mechanism When the lineis applied B to be covered. The indicating mechanism in this instance and also the screed member are not yet adjusted properly- The ends of the screed member are then vertically adjusted so that the screed will be at such a level, as compared to the given grade line, that it will level off the material to the proper crown. In this instance the screed will be tilted transversely of the road. If the level is parallel to the line, the bubble will not be in level indicating position. Therefore, the level is adjusted so that it will be tilted at an angle relative to the line 2l3 until the bubble is in level indicating position. As the machine moves along, the inner runner may run into a dip or may run up on a wave occurring transversely in" the surface B. Thus, the inner runner may rise or fall. However, when this happens the bubble of the level will indicate that the level of the screed relative to the given grade line is not proper.

Therefore, the operator may adjust the end C of .25

the level will always be in level indicating position. Thus, the indicating mechanism will indicate the position of the screed relative to the given grade line at all times and the operator may readily adjust the screed to keep it at its proper level so that transverse irregularities in the surface being covered will have substantially no eifect on,the crown produced by my machine.

It will be apparent from the preceding description that I have provided a machine having numerous advantageous features. Some of these features have been speciflcallypointed out in the preceding description and others will be apparent from the specification, drawings and the following claims. a By the term screed member used in the following claims, I intend to cover any member which is used for leveling oif the material to the desired thickness and contour, such as a strikeoff plate and other equivalent members.

Having thus described my invention, what I claim is:

1. A machine of the type described comprising a runner unit including a plurality of runner members which move along the surface to be treated and serve .as side forms, a spreading unit, means for tying said runner unit to said spreading unit, said means permitting said units to float vertically relative to each other during movement over the surface to be covered by preventing substantial relative lateral movement between said units, a main screed member carried by said runner members, means for permitting material to feed back past said screed member, said means comprising adjustable gates disposed at points adjacent the ends thereof, and an auxiliary screed member disposed rearwardly of said main screed member for operating upon the material.

'that feeds past said main screed member.

a spreading unit, means for tying said spreading unit to said. runner unit, said means permitting said units to float vertically relative to each other during movement over the surface to be covered but preventing substantial relative lateral movement between said units, a main screed member carried between said runner members, and extending transversely substantially at right angles to said runner members, means for permitting material to feed back past the ends of said main screed member and including adjustable gates carried at the ends thereof, and auxiliary screed members carried by said runners rearwardly of said main screed member for operating upon the material that feeds past said main screed member.

3. A machine of the type described comprising a runner unit including a plurality of longitudinally extending rlmner members of considerable length which move along the surface to be treated, a spreading unit, means for tying said spreading unit to said runner unit, said means permitting said units to float vertically relative to each other during movement over the surface to be covered but preventing substantial relative lateral movement between said units, a main screed membercarried by said runnermembers substantially midway between the ends thereof, means for permitting material to feed back past said main screed member and including an ad justable gate, and an auxiliary screed member disposed rearwardly of said main screed member for operating upon material that feeds back past said main screed member.

4. A machine of the type described including a pair of runner members which move along the surface to be treated, a main screed member carried by said runner members, means for permitmaterial spread by said spreading unit, said ting material to bleed back past the ends of said main screed member, said means being adjustable 'gates disposed at the ends thereof, and auxiliary screed members carried by said runners rear- ,wardly of said main screed members for 'operating upon the material that bleeds back past said main screed member, said auxiliary screed members being vertically and laterally adjustable relative to said runner members.

5. A machine of the type described including a plurality of runner members which move along the surface to betreated, a spreading unit, said spreading unit being tied to said runner members in such a manner that it may float automatically up and down relative thereto during movement of the machine along the surface to be covered, a main screed member for leveling ofl screed member being carried by said runner members, means for permitting material to bleed back past said main screed member, and an auxiliary screed member disposed rearwardly of said main screed member for operating upon material that bleeds back past said main screed member.

6. A machine of the type described including a runner unit embodying a plurality of runner members, a spreading unit, said spreading unit being tied to said runner unit in such avmanner that it may float automatically up and down relative thereto during movement of the machine along the surface to be covered, a main screed member carried by said runner unit for leveling oil material spread by said spreading unit, means for permitting material tobleed back past said screed member adjacent each runner member, and auxiliary screed members carried by the runa runner unit, composed of a pair of runners, a spreading unit carried by transporting means which operate outside of the inner surface of said runners, means for tying said spreading unit and said runner unit together in such a manner as to permit the spreading unit to float automatically up and down relative to the runner unit during movement of the machine along the surface to be covered, means for preventing substantial relative lateral movement between said units, said spreading unit including rearwardly diverging spreading blades for spreading the material laterally of the'surface being covered.

8. A machine of the type described comprising a runner unit, a second unit tied to said runner unit in such a manner that it may float automatically up and down relative thereto during movement of the machine along the surface to be covered, means for preventing substantial relative 1 lateral movement between said units, said second unit being carried by traction members operating outside of the inner edges or surfaces of the runner members of said runner unit, and adjustable means for causing the weight of the runner unit to be partly supported by the second unit in order to minimize friction developed by the runners sliding along the surface to be covered.

9. A machine of the type described comprising a runner unit, a spreading unit tied to said runner unit in such a manner that it may float automatically up and down relative thereto during movement of the machine along the surface to be covered, means for preventing substantial relative lateral movement between said units during the floating action, a screed member carriedby the runner unit, and means for tilting the en tire screed member about its own axis.

10. A machine of the type described comprising a runner unit, embodying a pair of runners joined together but spaced laterally from each other, a finishing member carried by said runners, means for permitting variation of the distance between said runner members, and a sec- 0nd unit tied to said runner unit in such a manner ners, means for permitting variation of the distance between said runner members, a second unit tied to said runner unit in such a manner that it may float automatically up and down relative thereto during movement of the machine along the surface to be covered, 'means for preventing substantial relative lateral movement between said units' during the floating action, said second unit being supported on tractionmembers which operate outside of the inner surfaces of the runners-of said runner unit, said traction members being mounted in such a manner that they may be moved laterally to permit variation of the distance between said runners.

12. A machine of the type described comprisinga screed member, means for vertically adjusting said screed member level" indicating means mounted to move vertically with the screed member when it is adjusted,'said level indicating means being initially positioned to indicate whether or not the screed member is level. said level indicating means being adjustable relative to the screed member in such a manner that it will be in level indicating position even though the screed is not level.

13. A machine of the type described comprising a screed-memben means for vertically adjusting said screed member, level indicating means, said level indicating means comprising a line extendingtransversely of the screed member ment of the machine along the surface to be covered, said second unit beingsupported on traction wheels which are disposed within the runner members and are substantially in alignment therewith.

15. A machine of the type described comprising a runner unit including a plurality of runner members, a second unit tied to said runner unit in such a manner that it may float automatically up and down relative thereto during movement of the machine along the surface to be covered, said second unit being carried by traction wheels which operate along. the same paths along which the runners operate.

16. A machine of the type described comprising a runner unit, a second unit tied to said runner unit in such a manner'thatit may float automatically up and down relative thereto, said second unit being carried by traction members operating outside of the inner surfaces'of the runner members of said runner unit, and adjustable means for causing the weight of the runnerunit to be partly supported by the second unit in order to minimize friction developed by the runners sliding along the surface to be covered,

said means including springs connected to the runner unit and to said second unit.

17. A machine of the type described comprising a runner unit including a plurality of runner members which move along the surface to be treated, a spreading unit for spreading the material on the surface to be covered, said spreading unit including a material receiving hopper, means for tying said runner unit to said spreading unit, said means permitting said units to float vertically relative to each other during movement over the surface to be covered, a main'finishing member for leveling off material spread by said spreading unit, said member being so constructed and arranged as to permit part of the material to feed rearwardly thereof as the machine progresses over the surface to be covered, and an auxiliary finishing member carried by the runner unit at a point rearwardly of the main nally extending runner members which are adapted to slide along the surface to be covered a second unit including a material receiving hopper supported on transporting members, means for tying said runner unit to said second unit, said means permitting said units to float vertically relative to each other. during.movement over the surface to be covered, a main finishlngmember for leveling of! material spread by said spreading unit, said member being so constructed and arranged as to permit part of the material to feed rearwardly thereof at points adjacent the ends thereof and adjacent said runner members as the machine progresses over the surface to be covered, and an auxiliary finishing member carried by each runner member at a point rearwardiy of themain finishing, member, said auxiliary finishing members operating upon material that feeds rearwardly past said main finishing member. I

19. A' machine of the type described including a plurality of runner members which move along the surface to be covered, a spreading unit, means for connecting said spreading unit to said runner members in such a manner as to permit the spreading unit and the runner members to float vertically relative to each other, a main screed member carried by said runner members, said main screed member being so constructed and arranged as to permit material to feed rearwardly thereof during movement of the machine over the surface to be covered, and auxiliary screed members carried by said runner members at a point re'arwardly of the main screed member for operating upon the material that feeds rearwardly of said main screed member.

20. A machine of the type described comprising a unit carried by transporting means, a second unit independent of the first unit, means for connecting said units together in such a manner as to permit them to float vertically relative to each other during movement of the machine over the surface to be covered but to prevent substantial relative lateral movement between said units, said second unit including a plurality of runner members which move along the surface to be treated, a main screedmember car-..

ried by said runner members, and auxiliary screed members carried by said runner members for to each other during movement of the machineover the surface to be covered, said second unit including a plurality of runner members which move along the vsurface to be treated, a main screed member carried by said runner members.

said main screed member being so constructed and arranged relative to the runner members that material will feed rearwardly past the ends thereof, and auxiliary screed members carried by said runner members for spreading said material laterally behind and beyond the advancing runner members and for leveling off said material, and means forv limiting lateral movement of the ma-. terial spread by said auxiliary screed members.

22. A machine of the type described comprising a runner unit embodying a plurality of runners that slide along the surface to be covered and bridge the irregularities thereof, a spreading unit carried by transporting means, said spreading unit includinga material receiving hopper, rearwardly diverging spreading blades for spreading'the material laterally-of the surface being covered mounted in the bottom of said hopper, and means-for tying said units together and preventing substantial relative lateral movement therebetween, said means permitting free vertical movement of the spreading unit'relative to the runner unit so that vertical movement of the member carried by said runner unit, means for vibrating said screed member, and means for tying said units together and preventing substantial relative lateral movement therebetween,

s a i d means permitting free vertical movement of the second unit relative to the-runner unit j so that vertical movement of the second unit caused by the transporting means operating over a rough surface will not be transmitted to said runner unit.

24. A machine of the type described comprising a runner unit embodying a plurality of runners that slide along the surface to be covered and bridge the irregularities thereof, a second unit carried by transporting means, a screed member carried by said runner units, means for vibrating said screed member, said means comprising a rotatable eccentrically mounted weight member, and means for tying said units together and preventing substantial relative lateral movement therebetween, said means permitting free vertical movement of the second unit relative to the runner unit so that vertical movement of the second 'unit caused by the transporting means operating over a rough surface will not be transmitted to said runner unit.

25. A machine of the type described comprising a runner unit includingaplurality of runner members which move' along the surface to be covered and bridge the irregularities thereof, a spreading unit carried by transporting means for spreading the material on the surface to be covered, a main finishing member carried by said runner unit for leveling off material spread by said spreading unit, said member being so constructed as to permit'part of the material to feed rearwardly thereof as the machine progresses rearwardly of the main finishing member for opt erating upon the material that feeds rearwardly 4 past said main finishing member, and means for tying said units together and preventing substantial relative lateral movement therebetween, said means permitting free vertical movement of the spreading unit relative to the runner unit so that vertical movement of the spreading unit caused by the transporting means operating over a rough surface will not be transmitted to said runner unit.

26. A machine of the type described comprising a runner unit including a plurality of runners which move along the surface to be treated and bridge the irregularities thereof, a second unit independent of said runner unit and carried by transporting means, means on said machine for spreading the material laterally across the surface to be treated, other means fcarried by the runners for spreading material laterally of the runners, and means for tying means permitting free vertical movement of the spreading unit relative to the runner unit so that vertical movement of the spreading unit said units together and preventing substantial relative lateral movement therebetween, said.

ing unit relative to therunner unit so that vertical movement of the spreading unit caused by the transporting means operating overa rough surface will not be transmitted to said runner unit, and adjustable means for causing the weight of the runner unit to be partly supported by the second unit in order to minimize friction developed by the runners sliding along the surface to be covered, said means including springs connected to the runner unit and to said second unit.

JOSEPH H. MOSEL. 

